Drill-twisting method and machine



J. F. MEYERS. DRILL TWISTING METHOD AND MACHINE.

APPLICATION FILED MAY 16, 1921. v g 3?, Patented Sept. 5, 1922;

8 SHEE1S-SHEET .S.

86 a my; VAL 0 M W A Joi m F/f 1. F. MEY ERS. DRILL TWISTING METHOD AND MACHINE APPLICATION FILED i/IAYHS, 1921. I I Patented Sept. 5, 1922.

' 8 SHEETS-SHEET 6.

7 l/VI/E/YTOR Jo/zzz F/Veyezes J. E. MEYERS;

DRILL 'TWISTI NG METHOD AND MACHINE. APPLICATION FILED MAYIG, I92].

Patented'fiebt. 5, 1922.

a SHEEIS-SHEEI 1'.

A rrorz/vfya J. F. MEYERS.

DRILLTWISTlNG METHOD AND MACHINE,

I 4 APPLICATION FAILED MAY16,19ZI. I v 4 1,428, 387. Patented Sept 5,1922

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71 Ill gum/ 1 llll I i I away/012 Z7Z3 do]??? F/Weyem anwwwm nd A TTO/B/YEKS Patented Sept. 5, 1922.

UNITED I err v JOHN MEYEns on-Anmmmrz, 'omo, ASSIGNOLB; To THE BUcKEY-nrwIs'r'nRr n COMPANEQ. OF ALLIANCE, OHIO, ,A. CORPORATION. 01? OHIO.

' nBrLL-Tms'rme mn'rnon aim MACH-ZINE.

Appiicationfiled. May 16, 1921. ser al No. 469,824.

The inventi on relates to meansfortwistin'g a drill from-a straight bar; and the object of theimprovement is totwist the, drill with a uniform pitch upon a straight axis,

with an apparatus adjustable, for twisting d'rllls of various pitches," diameters and The method ofitwistilng'a drill by turning means'applied to the ends ofthebar does not necessarily give a uniform pitch throughout .the length, because of the varying, physical conditions in different portions of the bar and the. method oftwisting a drill by a series ofv rotary dies operating on the bar in situ,

involves an apparatus practically limited to twisting a drill of given dimensions andde- "grees of pitch, from which the twisted drill must be removed by turning it as a sore from a threaded socket.

The present invention contemplates the useof adjustable dies successively operating upon adjacent. sections of the bar, which moves intermittently endwise intermediate.

the successive twisting operations, following which it drops endwise from the dies.

The improved'method and a preferred form. of machine for twisting a drill, are illustrated in the accompanying drawings forming art hereof, in which.--

Figure 1 is a front elevation of the machine, with the guide bar broken away;

Fig. 2; a side elevation of the same, with the base broken away; 7 v

3, a plan view of the twisting head in normal inoperative position; Q

Fig. 4, a section of the head on line IVIV', Fig. 3;.

Fig. 5, anenlar ed section of the twisting head on line V-'V Fig. 3, showing the. guide "bar and dies in sideelevation;

Fig. 6,'a similar view showing the guide bar in front elevatlon;

Fig. 7 5. an under side view of the rotary plate, broken awayyin one side to showdie adjusting screws;

' Fig. 'Z'and' 8 plate, broken away in Fig. 8 a front edge {elevation of the rotary plate; Fig. 9. a section of same on line IX- -IX,

I Fig. 10, a detached perspective view of one upper or twisted die;

Fig. 11, a plan view of the stationar-y basef adjusting screws;

plate- Fig- XIII, Figs. 11 and 12 Fig. 14;, a'detached perspective of one lower or stationary die;

Fig. '15, a plan, vlew or the head SllQWlIlg the rotary plate initially turned for receiving the drillblank to be stopped by'the holding dies Fig. 16, a fragmentary plan of the twisting dies showing in sectionthe initial position o'fa drillblank; v Fig; 17, a fragmentary plan of the station ary dies, showing in section the initial posi--' tion of a drill blank Fm. 18,3a fragmentary sectlon-on line XVfiI-XVIII Fig. 15, showing the. dies and drill blank iii-elevation;

one side to show die F f a r0n ge lei'at o the b e i asectionof same on line XIII with the rotary. plate turned; to the return 7 stop, andsh'owing. a bar in section therein 20, a fragmentary'section on line r1 XX XX," Fig. 1 9, showing'the dies and blank in elevation, and illustrating in full lines, the'initial twist given tothelowerend of the bar and" in broken lines, the position of the bar after a full twist has been given and the bar dropped down for a second twisting operation; a

Fig. 21, a plan view Crai twisting head with the rotary'plate turned tothejtwisting stop and showing-a blank in section; 5

Fig. 22. is a fragmentary section on line XXII-XXII, .21, showing the dies and blank in elevatiomJwith the lower end .sectionzof' the blank fully twisted; and

Themachine maybe mounted on a pedes- I 80 'Fig. 19, a plan view ofthe twisting head tal 1 and comprises a base plate 2 and a rotary plate 3 upon which is preferably mounted a standard t having an adjustable bracket 5 thereon for a guide bar 6.

The base plate 2 is secured upon a support, which may be the pedestal, and as shown in Fig-L 11 and is preferably in the form of a square block with raised corners 7 forming a circular recess 8 for receiving the rotary plate 3. v

The rotary plate 3 is preferably formed circular with a bottom flange 9 fitting in the circular recess of the base plate, over which flange extended corner plates 10,secured' adapted to be freely rotated.

I responding side of the drill blank 1 the drill blank in its median line.

The twisting dies 12 are located in a diametric channel 13 provided in the under side of the rotary plate, in which channels the dies may be adjusted to and from the center of the plate by means of screws ll and 15. as shown in Fig. 7.,

One lateral half of the end of each die is cut away 16 to give clearance for the corresponding half of a drill blank 17 and a laterally inclined facet 18 is formed on the other side on the end of the die, which is adapted to abut the fiat face 19 in the cor- 7, as shown in Figs. 16, 19, and 2l. The upper and lower edge 20 of each facet l8 is-preferahly beveled so as to present an obtuse corner, and the upper beveled edge serves to guide the end. of the blank into the interval between the dies.

The twisting diesare adjusted for use, so that the interval between the protruding edg s 21 in the middle of each die will be substantially the same as the thickness of The width of the dies is equal to the outside diameter'of the largest drill blank for which the machine may be used; and it is evident that the machine can be operated for twisting drill blanks of less diameter as shown in the drawings.

A central aperture 22 is provided in the rotary plate above the twistingdies, in which is set a bushing 23 having an internally beveled orrounded upper edge and an inside diameter for receiving the outside diameter of the drill blank and guiding the The stationary dies 24: are likewise lo' catedin a diametric channel 25 in the upper side of the base plate; in which channel the dies may be adjusted to and from the center of the disk by means of screws 14 and 15, as shown in Fig. 11.

v One lateral half of the end of each stationary die is cut away at 26 to give. clearance for the corresponding half of the drill blank 17, and a laterally inclined facet 27 is formed on the other side of the end of the stationary die, which facet is also inclined downward and forward from the upper face to the lower face of the die, and the facet is rounded adjacent to the lower face of the die so as to present a blunt edge 28 to impinge the corresponding flat face 19 in one side of the drill blank.

The stationary dies are adjusted for use,

so that the interval between tlie protruding corners 29 the middle of each diejwill be substantially the same as the thickness of the drill blank in its median line; and the width of the dies is equal to the outside diameter of the largest drill blank for which the machine maybe used, so that the machine can be operated for twisting drill blanks of less width, as shown iii-the drawings,

A central aperture 30 is proyided in the base plate below the stationary dies, through which a twisted drill is adapted to be discharged downward; and an inclined chute 31 may be provided in the hollow of the pedestal for delivering a twisted drill through an opening 82 in one side wall of the pedestal. s

A straight drill blank may be entered into the chine by inserting it manually through the guide bushing 22 and it is preferable to use the weighte'd. guide bar 6, mounted for endwise sliding in the guideway 33 in the bracket 5 whichbracket may be secured at different heights on the standl by means of cap screw 34; extending through the slot 35 in the depending portion 86 of the bracket. 7 W

A guide head 37 is formed or secured on the lower end of the guidebar, which guide head is provided with a downwardly facing, conical socket 38 whichis adapted to receive and rest upon the upper end of a drill blank for the purpose of centering and holding it in upright position; and a handle weight 39 is formed or secured on the upper end of the guide bar by means of which it may be raised and lowered. The weight of the handle supplements the weight of the drill blank and the guide bar, and serves to yieldingly press the drill bar downward by the action of gravity or a manual pressure during thetwisting operation,

A longitudinal groove eO'isprov ided in the one side of the guidebar, and a com-v municating annular groove" llis provided near the lower end of thebar; which grooves are adapted to receive a screw detent 42 in the bar may be moved "freely upward and downward by turning it so that the detent will operate in the longitudinal groove.

A handle 43 is secured to the top of the rotary plate 3 bymeans oi": which the same may be turned; and a series ofset screws 44 ar'ejprovided in the rim of the disk, in a plane above the corner plates 10, which screws are adapted to .be turned outward to formstops for engaginga spring'plungeri detent 45, mounted on one of the corner plates, for limiting the rotation of the disk one way or'another in the operation of the machine.

Preliminary to the twisting of a drill blank, the same is heated in the usual maning it into the twisting machine.

The normal inoperative position of the rotary plate illustrated in Figs. 1 to 13 inc usive of the drawings, is such that the twisting dies are in alinem'ent with the sta tionary dies so that a drill blank can pass endwise between all the dies; and for the purpose of setting the machine for receiving a drill blank for the twisting operation, the rotary plate is slightly turned in one direction, which may be anticlockwise, to an initial position as shown in Fig. 15, which is fixed by turning out one of the set screws to form a stop 44*. This initial'rotation slightly turns the twisting dies so that a drill blank cannot pass between the stationary dies.

\Vhen the rotary plate has been turned to initial position, as shown in Fig. 15, the.

guide bar is raised and the lower end of a drill blank 17 18 inserted downward through the guide bushing 23, and between the twist ing dies 12, as shown in Fig. 16, until the diagonally opposite edges of the blankim- 45 tions 28 of the stationary dies, as shown in Figs. 17 and 18. s v p With the drill blank in the initial position, the detent 45 is pulled outward'to clear the initial stop 44, and the rotary plate is fur pinge and rest upon the rounded edge porther turned in the same anticlockwise direction by the handle 43, until a stop 44 has cleared the sprin detent, which is then released to spring into the path of the stops, as

shown in Fig. 19, which figure shows the position of the parts'when set screw 44 serves as a return stop for the drill bar ina subsequent stage of the twisting operation.

At this point in the initial turning of the rotary plate, the lower end of the drill bar has been twisted somewhat as shown in full lines in Fig. 20; the twisting being done by the turning of the twisting dies against the diagonally opposite sides of the drill blank at a point above its lower end, whichlower end is held from turning by the bea'ring'ofthe stationary dies against the directly opposite sides of the end of the'blank.

The illustration of this stage :of' the" twisting operation is not intended to indicate that the turning of the rotary plate is stopped "at this point. In the operation of the machine, the initial anticloc wise rotation of the plate. is continued without stopping untilthe detent' 45 is impinged by the stop 449, the particular'loca tion of which is determinedby the pitch itis desired to give to the twist of the drill, thereby stopping the initial turning of the rotary plate at the time theparts are in position as shown in Fig. 2 1, and the lower end;

section of the drill, below the twisting dies,

has been given the full amount of twist. in tended for the drill, asshown in Fig. 22. nerto a forging temperature, before enter' The rotary plate is then turned in thereverse or clockwise direction until the detent 45Vis impinged by the return stop 44, as, i shown in Fig. 19, and'during th s operation,

the drill blank drops by the yielding action of gravity directly "downward, by 'asliding of the tw isted'taces upon the inclined facets of the stationary dies, as the bar is being yieldingly turned by the reverse movement of thetwisting dies; the position of the drill bar at the end of the first returnrotation of the plate 3 beingshown in broken lines in .Fig.20.

blank is stopped bya bearing of a twisted portion of the baru-pon the edges of the stationary dies; and each succeeding section of the drill blank is then twisted in the same manner as described for thetwisting ofthe lower'end section, whi ch is acconiplishedby merely repeating the anticlockwise turning of the rotary plate until the detent' is ini pinged by the stop 44 followed by a clockwise rotation of the plate until the detent is impinged] by the return stop" 44*, above described. p i

The operation of the machine "for the twisting of a drill of the guide barwhich restsupon the upper end of the drill blank, and not only centers 'ht oi the drill blank in supplements the wei causing itto move yieldingly downward each time the plate 8 is reversely rotated in clockwise direct on. i

The flat facets on the ends of the twisting dies serve to prevent any bending of the" drill blank above the loweredgesof the facets; and when a sufficient number of sectwisted to .iorm a drill of the desired length, the upper ends of the remaining straight is facilitated by the use the same during the twisting operation, but,

125. tions of the drill have been successively,

gi essee? portion 46 comprising the straight flute end of the drill may have dropped downward so that the guide head 37 will rest upon the guide bushing 23 as shown in 23; whereupon the rotary plate is reversely turned clockwise, back to the normal position shown in F 3, which permits the twisted drill to drop downward freely from the dies and to be delivered at one side of the machine.

The dies illustrated in the drawings are designed tor use in twisting a drill blank having longitudinal shallow ii-flutes in each side to form a double dovetail section, although it will be understood that the use oi the machine is not limited to flattened or fluted drill bar of this specific section.

An adjustment of the dies can be readily made for twisting drill blanks of various diameter, and the shape of the dies can be varied to conform to drill blanks of various shapes of cross section. There is no limit to the length or drill blanks which can be twisted by the improved machine, and the machine can be operated to twist the drill with any desired pitch by merely changing the position of the twisting and return stops,

which is readily done by using different set' screws for such stops.

The operation O'i the machine in successively twisting comparatively short sections of the blank in exactly the same manner, insures a uniformity of the twist throughout the length of the drill; and the guiding action of the machine insures that all the twists will be made in exactly the same axis, thereby certainly producing a drill tree oil lateral deflections.

It is evident that the method and machine illustrated and described herein, may be used for twisting reamers, and other like tools, as well as drills; and the use of the term drill in the description and claims is intended to be inclusive of such other tools.

I claim 1. The method of twisting a drill blank which consists in successively twisting short sections of tie blank and intermittently moving the blank endwise between successive twisting operations.

2. The method of twisting a drill blank which consists in successively twisting short sections of the blank and intermittently moving the blank endwise by a yielding pressure between successive twisting operations.

3. The method of twisting short sect-ions of the drill blank by adjacent dies relatively rotary and stationary, reversely rotating the blank between successive twisting operations, and yieldingly moving the blank endwise during the reverse rotation of the same.

l, A. drill blank twisting machine com prising rotary dies anti adjacent stationary dies :tor twistin an intervening section of a blank extended through the dies, and yielding pressure means for moving the twisted section between the dies through the stationary dies.

5. A drill blank twisting machine comprising a base plate and rotary plate, adjace dies in the plates for twisting an intervening section ot a blank extended through the dies, and yielding pressure means for moving the blank endwise.

6. A drill twisting machine comprising a base plate and a rotary plate, dies in the plates each engaging one lateral half only of the drill blank, and variable means for stopping the turningoi the rotary plate in opposite directions.

7. A dr'll twisting machine comprising a base plate and a rotary plate each having central apertures, dies in the plates each enone lateral half only of the drill blank, and a bushing in one of the apertures for guiding the blank.

8. A drill twisting machine comprising a base plate and a rotary plate, dies in the plates each engaging one lateral halt only of the drill blank and a guide bar bearing on the end of the blank.

9. b. drill twisting machine comprising a base plate and a rotary plate, dies in the plates each engaging one lateral half only 01' the drill blank, and a guide bar bearing on the end oi the blank with a socket for centering the blank.

10. 11 drill twisting machine-comprising a base plate and a rotary plate, and dies in the plates each engaging one lateral half only of the drill blank, the dies in one plate having flat facets engaging the corresponding side of the blank.

11. ii. drill twisting machine comprising a base plate and a rotary plate, and dies in the plates each engaging one lateral half only of the drill blank, the engaging side of the dies in one plate having inclined facets facing the dies in the other plate.

12. A drill twisting machine comprising a base plate and a rotary plate, and dies in the plates each engaging one lateral half only of the drill blank, the engaging side of the dies in one plate having inclined facets facing the dies in the other plate with blunt edges impinging the corresponding sides'of the blank.

JOHN F. MEYERS. 

